Affiliation:
1. Physics Department V. Karazin Kharkiv National University 61022 Kharkiv Ukraine
2. Faculty of Physics University of Vienna 1090 Vienna Austria
3. Vienna Doctoral School in Physics University of Vienna 1090 Vienna Austria
4. Faculty of Computer Sciences University of Vienna 1090 Vienna Austria
5. B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 61103 Kharkiv Ukraine
Abstract
Superconducting bridges exhibit many properties of a Josephson junction, such as the electromagnetic radiation at overcritical currents and steps in the microwave‐irradiated current–voltage (I–V) curves. These Josephson effects stem from the periodic motion of magnetic flux quanta (vortices) in the narrowest region of the bridge. According to the Aslamazov and Larkin (AL) theory, the I–V curve of such a constriction should exhibit voltage kinks each time the number of vortices in the 1D vortex chain is increased by one. However, in the presence of defects and fluctuations, the intervortex repulsion stipulates the formation of a 2D vortex jet, which goes beyond the 1D AL model. Here, by milling one or two slits across a MoSi thin strip, we make vortices to move in a vortex–jet or a vortex–chain fashion, respectively. Unexpectedly, for the strip with a vortex jet, we observe equidistant voltage kinks at transport currents which are rather far from the assumption of in the AL model. At the moment, we have no explanation for this observation, tending to attribute it to fast relaxation processes in MoSi and looking forward for a comparison with other superconducting materials.
Funder
Austrian Science Fund
IEEE Foundation
European Cooperation in Science and Technology
Subject
Condensed Matter Physics,General Materials Science
Cited by
2 articles.
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